I would to ask you if you know a pci card supporting DVB-RCS
(Return-Channel-via-Satellite) technology or any other linux-compatible
hardware that could work on two-way mode, both sending and receiving
data, using VSAT system preferably.

We work at innovation center in Venezuela, and we are looking for a free
software, low-cost and high-scalable solution allowing us to deploy a
communication system based on a standard satellite technology.